In a large skillet, heat canola oil until shimmering. Add onion, bell pepper, garlic, and chili powder and season with salt and pepper. Cook over high heat, stirring, until softened and browned in spots, about 5 minutes. Add beef and gravy and cook, stirring, until just heated through, 1 minute. Serve beef and vegetables in warm tortillas with salsa, sour cream, and cilantro.

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